/Engine/Plugins/Animation/RigLogic/Source/RigLogicLib/Public/dna/layers/MachineLearnedBehaviorWriter.h
These indices can be used to access neural networks through the below defined APIs.
void setNeuralNetworkIndicesForMeshRegion ( std::uint16_t meshIndex, std::uint16_t regionIndex, const std::uint16_t * netIndices, std::uint16_t count )